风切变指数的确定对风电场风速推算的影响分析

Effect Analysis on the Wind Shear Exponent for Wind Speed Calculation of Wind Farms

基于内蒙古地区地形相似、相距约18 km的两个风电场内2个测风塔共10个测风高度完整一年的测风资料,根据普朗特经验公式推导出的风切变指数关系式,采用4种不同的方法计算各相邻高度间的风切变指数。根据风切变指数的计算结果分析风速随高度的变化情况,通过不同方法的对比分析,选择合适的方法计算风切变,为确定风电场适宜的轮毂高度提供参考。

This paper based on the Inner Mongolia area tow wind farms with similar complex terrains, a distance of about 18kin at two wind farms, Wind date collected at the ten measurement heights of two monitoring masts in two farms in a complete year were used for the calculations of the wind shear exponent. Basing on the Prandfl formula using 4 different methods to calchlate the wind shear exponent between adjacent heights, according the calculation results of the wind shear exponent to analysis the wind speed change with height of wind farm, Through comparing the calculation results with different methods to select appropriate methods. The paper provides reference for deter- mining the appropriate referral hub height.